Universal tool sharpening and work holder



' A ril 4, 1939.

c. c. CHARTIER 2,152,729

UNIVERSAL TOOL SHARPENING AND WORK HOLDER Filed Aug. 26, 1935 5Sheets-Sheet l ATTORNEY April 4, 1939. CHARTER 2,152,729

UNIVERSAL TOO L SHARPENING AND WORK HOLDER Filed Aug. 26, 1935 3Sheets-Sheet 2 gunms c. CHAR 7/0? /vv/v 70/? April 1939. c. c. CHARTIER2,152,729

UNIVERSAL TOOL 'SHARPENING AND WORK HOLDER v Filed Aug. 26, 1935 3Sheets-Sheet 3 Z7 PM ATTORNEY Patented Apr. 4, 1939 f UNITED STATESPATENT OFFICE UNIVERSAL TOOL SHARPENING AND WORK HOLDER 1 Claim.

This invention relates to an improved universal tool sharpening and workholder, and has for one of its principal objects, the provision of asimple yet efiicient tool sharpening and work holder which is adapted tobe used in combination with a grinding wheel or the like for thesharpening of various tools and with a degree of accuracy not possibleby hand.

One of the important objects of the invention is to provide a toolsharpening and work holder which is relatively inexpensive, but whichwill, at the same time, provide means for sharpening a variety of toolsand for performing a number of related and difierent operations with agrinding wheel or the like, which means is ordinarily found only in veryexpensive and much more elaborate equipment.

Another object of the invention is to provide means for readily andaccurately holding various tools or other implements or even parts to bemachined or otherwise operated on in desired and correct position withregard to an operating member such as a grinding wheel or the like,which device is composed of a minimum number of relatively simple partswhich are interchangeably related to each other and some of which arealso interchangeable with other parts so that a large number ofcombinations of tool-holding structures together with a correspondinglylarge number of tool-holding positions can be readily accomplished.

Another and still further important object is to provide in atool-holding apparatus, means for shifting the same in various planesand at various angles to produce an accurate grinding,

sharpening or other operation.

Another object is to provide means for producing an accurate hollowground edge on various tools which is, of course, desirable, but whichheretofore has been throught impossible without expensive equipment.

A still further object is the provision of means for mounting awheel-dressing element in conjunction with the grinding wheel so thatthe grinding wheel can be trued to desired contour after wear, and theapparatus includes means for accurately yet simply trueing the wheelwith such dressing apparatus.

Other and further important objects of the invention will be apparentfrom the disclosures in the accompanying drawings and followingspecification.

The invention, in a preferred form, is illustrated in the drawings andhereinafter more fully described.

In the drawings:

Figure 1 is a top plan view of the improved universal tool sharpeningholder of this invention, showing the same in one representativeposition as related to a grinding Wheel and with a tool mounted in theholder for a sharpening operation thereon.

Figure 2 is a side elevation of the device shown in Figure 1, showingthe apparatus in substantially the same position as that illustrated inFigure 1.

Figure 3 is a view somewhat similar to that of Figure 2, only showingthe holder with the tool to be sharpened in a different position wherebythe desired rounded sharpened edge is obtained. 15

Figure 4 is a top plan view of the device, showing the same in aposition slightly different from that illustrated in Figure 1 andholding a drill bit or the like for an accurate sharpening process.

Figure 5 is a side elevation of the structure shown in Figure 4.

Figure 6 is a perspective view of the particular type of holder for thedrill bit which holder is illustrated in Figures 4 and 5.

Figure 7 shows the apparatus in still another position and supporting awheel-dressing tool.

Figure 8 is a side elevation of the structure shown in Figure '7.

Figure 9 shows a modification of the apparatus, illustrating a formwhereby the same is adapted for turning through a greater angle orcircuit than is possible with the construction shown in the precedingfigures.

Figure 10 is a side elevation of the device of Figure 9, showing anadditional dressing element applied thereto.

Figure 11 illustrates a further embodiment oi the invention showing thesame with another attachment thereon and in a position only slightlydifferent from the positions of Figure 7 and 8, but adapted to hold achisel or similar tool for a hollow grinding sharpening operation.

Figure 12 is a side elevation of the structure shown in Figure 11.

Figure 13 illustrates another embodiment of the invention with adifferent attachment, for example, one adapted to hold a knife or thelike for a sharpening operation.

Figure 14 is a side elevation of the structure of Figure 13, showing thesame in one position.

Figure 15 is a similar side elevation showing the sharpening apparatusin a different position.

Figure 16 is a perspective view of the brackets or holders adapted to beused with the structures M of Figures 13, 14 and 15.

Figure 17 is a plan view of a gauge to be used in connection withdrill-bit sharpening operations.

Figure 18 is a sectional view showing an adaptation of the invention.

Figure 19 is a detail View, partly in section, of the swiveled mountingshown in Figures 2 and 3.

Figure 20 is an enlarged detail view of the base positioning andfastening means illustrated in Figure 5.

Figure 21 is a detail View, partly in section, of a clamping means fordrill bits and similar elements to be sharpened or otherwise worked on.

As shown in the drawings:

The reference numeral 20 indicates generally the base plate or mainsupporting element of this invention, the same adapted to be applied toa work bench or table 2! by means of bolts or the like 22 passingthrough slots 23 in the plate 21 A special form of fastening means isshown in Figures 5 and 20 wherein a bolt 3| has a shank which passesthrough the plate 26 and into fitting 62 which is countersunk in thework bench 2i, this fitting having internal screw threads for thereception of the bolt 6! and external screw threads 33 together with awedge-shaped head 64 for better positioning and gripping relationshipwith a correspondingly shaped recess in the work bench 2 i. Slots areprovided in the top of the element 62 so that the same can be readilyinserted into a work bench or removed therefrom by means of ascrewdriver or the like.

The plate 20 has one up-turned edge in the form of a ridge or the like2% and the other edge is shaped into a series of hinge structures 24complementary to similar hinge structures 23 integral with a cooperatingplate 27 (Figures 1, 2 and 3). A removable hinge pin 28 is provided sothat these two elements 20 and Z'i can be removably fastened together inhinged relationship,

The upper edge of the plate 21 is bent over slightly as illustrated at29, and this portion is provided with a series of openings 39 adaptedfor the passage of fastening bolts or the like 3| therethrough, andanother series of openings 32 is provided in the plate 21 adjacent andjust below the turned-over edge 29 (Figure 1).

This provides for the attachment of quite a number of various holders orbracket elements thereto such as, for example, the plates 33 and thebolts 3! shown in Figures 2 and 3 which, in turn, hold a tool grippingelement 35 in desired position on the hinged plates. This tool grippingelement is that ordinarily used to support a cutting tool or the like 33which, in this instance, instead of being used for a cutting operationis maintained in the holder for sharpening purposes and is adapted to beheld against a grinding wheel 31 for such sharpening operation,

It will be noted from a study of Figures 2 and 3 that the tool holderwith the tool 36 can be shifted from the uppermost position as shown inFigure 2 to a lower position as illustrated in Figure 3, while, at thesame time, the tool holder 35 is moved around its pivotal support which,in this instance, happens to be a bolt 3! passing through a washer 66rotatably positioned in one of the openings 30 in the plate 2? (Figure19). This allows the production of an accurately rounded cutting edge onthe tool 36, and it will be readily understood that such an operation isordinarily quite difiicult, especially if attempted to be performed byhand.

As shownin Figure 4, the plate'2fl is used to support the complementaryplate 2,? in another position, the hinge pin 28 being removed and thenreplaced after relative shifting of the plates, and in this instance, adifferent type of tool support 38 is provided which is mounted on theplate 27 by means of a bolt 39, this tool supporting element 38 beingshaped as best shown in Figure 6, and having an opening 40 in oneportion thereof for the reception of the bolt 39.

This particular embodiment is adapted for the sharpening of a drill bit4| which is held at a desired angle, the angle being predetermined bymeans of the gauge 61 shown in Figure 17, and a simple rotation of thedrill bit 4|, while being held in sharpening relationship with therotating wheel 3'! will produce a desired rounded angular cutting edgethereon. This is another operation which ordinarily requires anexpensive complicated machine to produce anything like a satisfactoryresult, but which here can be simply, easily and readily accomplishedwith a minimum of time and effort, and also without the necessity of anygreat amount of special skill or technique.

In Figure 7 is illustrated a further variation of the apparatus which isadapted for the accurate dressing or the grinding wheel 31 when suchdressing becomes necessary, the plate 21 being shifted from its hingedrelationship with the plate 26 to a simple swinging support against theupturned ledge 24 at the rear end of the plate 20, and thereby allowingof a slidable movement of the plate 2T with respect to the plate 20while, at the same time, assuring a desired movement in one plane only.

A wheel-dressing tool 42 is mounted on the upturned edge 23 of the plate21, this being by means of a suitable special supporting bracket 43 asbest shown in Figure '7, but obviously this particular type ofsupporting bracket may be changed, and one such as shown in two parts at44 in Figure 16 may be substituted therefor, the slots 45 being for thereception of bolts adapted to secure these brackets to the element 29and the aligned openings 46 being for the reception of thewheel-dressing supporting spindle 41 (Figure 7).

In Figures 9 and 10 is shown a further modification of the inventionwherein a smaller sup porting plate 4? is used instead of the originalbase plate 23, this having a single slot 48 and a single grinding bolt49 about which the plate 41 may be pivotally shifted, if desired,thereby providing for a turning movement of the whole apparatusincluding the plate 2'! which, in this instance, is held in desiredposition by having a hooked over integral portion 50 of the plate 41fitted over and into gripping relationship with the hinged elements 2%of the plate 21.

A supporting bracket is passed through one of the holes 32 of the plate2?, this bracket being shown at 5| in Figure 10 and being held inposition by means of a suitable nut or the like 52 operating againstanother nut or a shoulder 53 thereon. This enables a proper angularpositioning of the plate 21 with respect to the bench or table 2i andalso a proper angular positioning of any tool or other element so far asits relationship with the grinding wheel 37 is concerned..

In Figures 11 and 12 is shown a further modification of the inventionwherein another clamping element 54 is adapted to be associated with theinturned edge of the plate 21 by means of suitable clamping bolts or thelike 55, and this,

the curvedface of the grinding wheel 31 can be given an accurate hollowground edge such as shown at 51 in Figure 12. The same can be movedacross the face of the wheel 31 by sliding the plate 21 relatively tothe plate 20, the lower edge of the plate 21 being positioned againstthe upturned ledge 24 of the plate 20 in somewhat the same relationshipas shown in Figure 8.

A still further embodiment of the invention is shown in Figures 13, 14and 15, illustrating the same as adapted for the sharpening of a knifeor the like, the plate 21 being hingedly associated with the plate 20somewhat in the Same relationship as in Figure l, but with a differenttype of bracket or support 58 mounted thereon comprising a suitablecombination of plates and bolts adapted to grip a knife handle or thelike 59 having a blade 6|].

As shown in Figures 14 and 15, the plate 21 can be rotatably shiftedabout the hinge 28 on the plate 20, thereby moving the blade 60 intovariouspositions with regard to the wheel, and at the same time theangular relationship of the blade is maintainedas originally set ordesired on account of the locked position of the bracket 58.

The gauge, illustrated in Figure 17, comprises one piece of metal or thelike in the shape of a T, and the angular edge of a drill bit or thelike M can be preliminarily measured in such a gauge, and then suchangular relationship maintained during the sharpening operation byputting the point of the drill bit into the preliminarily set gauge atany desired or convenient time during the operation.

In Figure 18 is shown a further adaptation of the invention wherein theplate 21 has mounted thereon an angular holding element 68 somewhatsimilar to the support 38 shown in Figure 6, but which is adapted forthe reception and proper positioning of a tool or some other piece ofwork to be operated upon, such as, for example, a square piece of steelor the like 69.

As best illustrated in Figure 21, a drill bit or similar instrument canbe securely clamped in position in the tool or work holder 38 by meansof a hook or the like 10 which has a screwthreaded shank 1|, the samepassing through a corresponding opening in a block 12 which is shaped tofit the outside contour of the element 38, and a wing nut 13 is providedfor proper tightening of the clamping hook in position. This, of course,passes through a suitable slot or opening in the element 38 which isbest shown at 14 in Figure 6. A curved slot 15 is also provided inanother face of the element 38, this curved slot being formed on aradius which has for its center the central point of the opening 40, anda suitable bolt with a wing nut thereon can be passed through the slot15 and through one of the openings 30 or 32 in the plate 21 so that afurther angular adjustment of this support 38 with respect to the plate21 can be made and retained as desired.

It will be evident that herein is provided a universal sharpening toolwhich can be adapted for use with an ordinary grinding wheel and whichwill accurately and quickly put a desired cutting edge upon almost anytype of tool with a minimum of eifort, both so far as preparation andactual operation is concerned, and, furthermore, the entire apparatus issimple of construction, but, on account of its various modifications canbe adapted for use with a great multiplicity of tools and otherimplements including various operations and will meet almost anycontingencies which might arise in connection with the handling,sharpening and operation of metal and woodworking tools. The degree ofaccuracy obtained is remarkable in view of the simple nature of theentire apparatus, and the construction of the same is such that a properpreliminary setting of the same will almost automatically produce adesired and practically per fect result.

I am aware that many changes may be made and numerous details ofconstruction varied throughout a wide range without departing from theprinciples of this invention, and I, therefore, do not purpose limitingthe patent granted hereon otherwise than as necessitated by the priorart.

I claim as my invention:

A universal sharpening tool and work holder comprising a base plate,means to fixedly position same on a work bench in conjunction with agrinding wheel, a supporting plate hingedly and shiftably mounted on thebase plate, and means on the supporting plate for pivotally andshiftably retaining a tool to be sharpened, said means comprising aplate having two angular bends therein, one bend for positioning a toolto be sharpened and the other bend outlining an extension having apivotal opening and a circular slot therein, and means for shifting theplate about said pivotal opening, said means being circumscribed by theslot.

CURTIS C. CHARTIER.

